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Tuesday, November 7. 2017

Following on from the previous article, this describes a corosync configuration for three appliances configured together in a 'triangle'. OSPF/BGP is running on each appliance. With this routing configuration, I am able to apply an ip address to the loopback interface, and make each of those addresses mutually reachable from each appliance.

I think most corosync examples make the assumption that all nodes are within the same segment. This then suggests a multicast solution. As I am using routing between each appliance, I need a unicast solution.

The following is an example configuration file for the second of three nodes / appliances. Notice the bind_addr is for the loopback address, and a complete list of all three nodes taking part in the quorum. There is a 'mcastport' listed, but because of 'transport: udpu', unicast is actually used from that port number.

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